Quantity: Hazardous Air Pollutants
The EPA's AirData reports, using data from the NEI database, provides hazardous air pollutant emissions for year 1999. County-level aggregate emissions are provided for all types of sources, and facility-level emissions are provided for each major point source.
Essex County HAPs:
The chart below shows all individual HAPs in Essex County above 10 tons. The 5 largest individual chemical air emissions are Toluene, Xylene, Hydrochloric Acid, Diesel Particulate, and Benzene, with the majority of all but Hydrochloric Acid, being contributed by mobile sources (both on and off-road).
3 TOWN LEVEL – MAJOR SOURCES:
Again, starting with the 1999 EPA NEI data, the individual HAPs that contributed more than 1 ton (2000 pounds), were identified as shown in the chart below.
Note that for the three target communities, hydrochloric acid is by far the largest single contributor from Major Sources due to the location of USGEN (The Salem Harbor Power Station). The second largest contributor from Major sources in EPA’s 1999 estimate, however, is toluene, with the primary sources identified as three landfill type operations, that would not normally report as major sources under other tracking systems. This is also the case with xylenes, methlyene chloride, about half of the hexane, and the majority of benzene. This leaves just hydrochloric acid, hydrogen fluoride, and nickel compounds possible to compare to more recent data reported through the standard tracking systems.
Of the “Major” Air Sources that report to the State, more recent data could be gathered. Additional detail level information can be determined for the VOC category that relates to the Criteria Air Pollutants as well as some additional Hazardous Air Pollutants that are neither VOC nor Criteria Air pollutants. This additional information is collected through the EPA TRI and MADEP TURA reporting systems.
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